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외경 9.52mm 평활관 및 미세핀관내 R22와 R410A의 증발열전달 특성
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 Title & Authors
외경 9.52mm 평활관 및 미세핀관내 R22와 R410A의 증발열전달 특성
김만회; 신정섭; 임병한;
 
 Abstract
An experimental investigation of evaporating heat transfer in 9.52mm horizontal copper tubes was conducted. The refrigerant tested were R22 and near-azeotropic mixture, R410A. The test rig had a st raight, horizontal test section with an active length of 0.92m and was heated by the heat transfer fluid(hot water) circulated in a surrounding annulus. Constant heat flux of 11.0kW/m2 was maintained and refrigerant quality varied from 0.2 to 0.8. The results were reported for evaporation at 15℃ in a 0.92m long test section for 30∼60kg/h mass flow rate. The local and average heat transfer coefficients for seven microfin tubes were presented compared to those for a smooth tube. The average evaporation heat transfer coefficients of R22 and R410A for the microfin tubes were 86∼227% and 64∼199%, respectively, higher than those for the smooth tube. When compared to R22 at the same test conditions, the evaporating heat transfer coefficients for R410A were 97∼129% of R22.
 Keywords
Alternative Refrigerant;Air-Conditioner;Evaporator;Heat Transfer Coefficient;Evaporation;Microfin Tube;
 Language
Korean
 Cited by
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